SID Air Chamber Valves are used to keep air in your Bestway Lay-Z-Spa air chamber. Replacement Air Chamber Screw Valve to fit later Bestway Lay-Z-Spa inflatable hot tub models. Valve fits the following models: Bestway Lay-Z-Spa Premium/Miami Model Number BW54112 (Later Style), Bestway Lay-Z-Spa Vegas Later Style (with either single valve or 3 valves), Riviera, Saint Tropez, New York, Paris, Vegas, Miami, Maldives, Bali, Tahiti, Cancun, Ibiza, Havana, Baja, Rio, St Lucia, Bahamas, Barbados, Madrid, Palma, Fiji, New York. Essential for inflation and deflation. Prevents air from leaking out of the Lay-Z-Spa. Direct replacement for a lost or broken valve. Screw diameter approximately 22mm. Made with high-quality materials to ensure reliable performance. Designed for easy installation and secure fit. Please verify compatibility with your model before purchase.